Laser Projector Light Source System Without Relay
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Solution Overview
Problem
Existing laser projector light source systems are bulky and lack flexibility due to the need for numerous optical elements and a relay system, making it difficult to adjust the spectral energy distribution of the outputted white light beam.
Innovation Solution
A light source system comprising two laser modules, a light-guiding module, and a wavelength conversion device that integrates light beams without a relay system, allowing for easy adjustment of spectral energy distribution by varying the output power of the laser modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay system with numerous optical elements is used to guide the laser beam, then the light beam can be properly directed to the dichroic mirror, but the size of the light source system becomes huge
Solution Approach 1:
The patent extracts and removes the relay system from the optical path by using a dichroic beam splitter that directly receives the laser beam from the laser module. This eliminates the need for multiple optical elements (lenses and mirrors) that were previously required to guide the beam, thereby significantly reducing the system size while maintaining proper beam guidance functionality.
Solution Approach 2:
The dichroic beam splitter performs multiple functions: it reflects the laser beam from the laser module toward the projection system, and simultaneously allows the fluorescent light beam from the wavelength conversion device to pass through to the light rod. This multi-functionality replaces the need for separate optical elements in the relay system, reducing overall system complexity and size.
2Device complexity
If a single laser module is used as the sole energy source, then the system structure is simplified, but the spectral energy distribution of the outputted white light beam becomes difficult to adjust
Solution Approach 1:
The patent introduces a wavelength conversion device (phosphor wheel) that can be rotated to dynamically adjust the spectral energy distribution of the output light. By rotating the phosphor wheel to different angular positions, different wavelengths of light are converted, enabling dynamic adjustment of the spectral characteristics while maintaining a relatively simple system structure with a single laser module.
Solution Approach 2:
The system changes the wavelength parameter of the light beam by using a wavelength conversion device that converts the laser beam wavelength to different fluorescent light wavelengths. This parameter change enables spectral energy distribution adjustment without requiring multiple laser modules, thus maintaining structural simplicity while achieving adaptability.
3Adaptability or versatility
If the angle of the penetration area on the phosphor wheel is changed to adjust the duration ratio of fluorescent light beam and laser beam, then the spectral energy distribution can be modified, but the system lacks flexibility for dynamic adjustment
Solution Approach 1:
Instead of changing the fixed angle of the penetration area, the patent uses a rotatable phosphor wheel that can be dynamically adjusted to different angular positions. This dynamic adjustment mechanism provides flexibility and ease of operation, allowing the spectral energy distribution to be modified by simply rotating the wheel to different positions rather than physically altering the penetration area angle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces size and enhances flexibility by eliminating the relay system and enabling dynamic adjustment of spectral energy distribution to meet various projection demands.
Implementation Method 1
The first wavelength conversion device has a first wavelength conversion layer used to be stimulated by the first reflected light beam to generate a first stimulated light beam traveling against the first reflected light beam
Implementation Method 2
The light rod is used to integrate the first stimulated light beam and the second reflected light beam to generate the integrated light beam
Data Source
AI summary
A first laser module generates a first light beam along a first light path. A second laser module generates a second light beam along a second light path. A light-guiding module reflects the first light beam to generate a first reflected light beam along a third light path and reflects the second light beam to generate a second reflected light beam along a fourth light path. A wavelength conversion layer of the wavelength conversion device is stimulated by the first reflected light beam to generate a stimulated light beam against the first reflected light beam. The light-guiding module directs the stimulated light beam to the fourth light path. A light rod integrates the stimulated light beam and the second reflected light beam to generate an integrated light beam.